arch/arm/mach-anakin/irq.c

   1 /*
   2  *  linux/arch/arm/mach-anakin/irq.c
   3  *
   4  *  Copyright (C) 2001 Aleph One Ltd. for Acunia N.V.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Changelog:
  11  *   10-Apr-2001 TTC    Created
  12  */
  13
  14 #include <linux/ptrace.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/init.h>
  17
  18 #include <asm/irq.h>
  19 #include <asm/mach/irq.h>
  20
  21 extern unsigned int anakin_irq_mask, anakin_active_irqs;
  22 extern void do_IRQ(int, struct pt_regs *);
  23
  24 static void
  25 anakin_mask_irq(unsigned int irq)
  26 {
  27         anakin_irq_mask &= ~(1 << irq);
  28 }
  29
  30 static void
  31 anakin_unmask_irq(unsigned int irq)
  32 {
  33         anakin_irq_mask |= (1 << irq);
  34 }
  35
  36 /*
  37  * This is a faked interrupt to deal with parallel interrupt requests
  38  * on the Anakin.  Make sure that its interrupt number is not in any
  39  * way conflicting with the hardware interrupt numbers!  Check
  40  * IRQ_ANAKIN in linux/include/asm-arm/arch-anakin/irqs.h.
  41  */
  42 static void
  43 anakin_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  44 {
  45         for (irq = 0; irq < NR_IRQS; irq++)
  46                 if (anakin_active_irqs & (1 << irq))
  47                         do_IRQ(irq, regs);
  48 }
  49
  50 static struct irqaction anakin_irq = {
  51         .name           = "Anakin IRQ",
  52         .handler        = anakin_interrupt,
  53         .flags          = SA_INTERRUPT
  54 };
  55
  56 void __init
  57 irq_init_irq(void)
  58 {
  59         unsigned int irq;
  60
  61         for (irq = 0; irq < NR_IRQS; irq++) {
  62                 switch (irq) {
  63                 case IRQ_UART0:
  64                 case IRQ_UART1:
  65                 case IRQ_UART2:
  66                 case IRQ_TICK:
  67                 case IRQ_CODEC:
  68                 case IRQ_UART4:
  69                 case IRQ_TOUCHSCREEN:
  70                 case IRQ_UART3:
  71                 case IRQ_FIFO:
  72                 case IRQ_CAN:
  73                 case IRQ_COMPACTFLASH:
  74                 case IRQ_BOSH:
  75                 case IRQ_ANAKIN:
  76                         irq_desc[irq].valid = 1;
  77                         irq_desc[irq].mask_ack = anakin_mask_irq;
  78                         irq_desc[irq].mask = anakin_mask_irq;
  79                         irq_desc[irq].unmask = anakin_unmask_irq;
  80                 }
  81         }
  82         setup_arm_irq(IRQ_ANAKIN, &anakin_irq);
  83 }